Carburetor



Feb. 22, 1955 E. B|MBERG I 2,702,562

CARBURETOR Filed Aug. 15, 1948 IN VEN TOR.

E MEB M. B! 5:26

A TTOENEY United States Patent CARBURETOR Elmer M. Bimberg, Detroit,Mich., assignor to Bendix Aviation Corporation, South Bend, Ind., acorporation of Delaware Application August 13, 1948, Serial No. 44,183

9 Claims. (Cl. 137-434) The present invention relates to carburetors andmore particularly to a fuel inlet valve control mechanism forcarburetors. I

One of the principal objects of the present invention is to provide asimple and positive connection between the float lever and fuel inletvalve of a carburetor in which there is no appreciable backlash or lostmotion and which permits the float and valve to be readily assembled inthe carburetor and thereafter easily serviced.

Another object of the invention is to provide a readily responsive fuelinlet valve control mechanism for a carburetor adapted to minimize theeffect of engine vibratiaoln and road jarring on the operation of thefuel inlet v ve.

Further objects and advantages of the present invention will becomeapparent from the following description and accompanying drawings,wherein:

Figure 1 is a side elevation of a carburetor embodying my invention inwhich the fuel bowl and valve are shown in cross-section;

Figure 2 is a view of the float and fuel valve of Figure 1 removed fromthe carburetor;

Figure 3 is a top plan view of a modified form of my invention showingthe connection between the float lever and fuel valve in section;

Figure 4 is a view of the float lever, fuel valve connection taken online 4--4 of Figure 3; and

Figure 5 is a fragmentary side elevation of the float and fuel valveshown in Figure 3.

Referring more specifically to the drawings, numeral designates an airhorn of a single barrel downdraftcarburetor, numeral 12 a fuel bowlmounted on and formed integrally with the main body of the carburetor,and 14 a throttle valve mounted on a shaft 16 in throttle body 18, aflange 20 being provided at the base of the throttle body for securingthe throttle body to an intake manifold (not shown). The fuel isdelivered to the fuel bowl from a suitable source, such as a tank orfuel pump, through a conduit 26 to a fuel inlet valve 28. The valve iscontrolled by a float 30 supported by a lever 32 pivoted on a pin 34 ata point between the float and fuel inlet valve. In the embodiment of theinvention shown in Figures 1 and 2, ears 40 and 42 formed integrallywith the float lever on the end opposite the float are turned downwardlyand inwardly to form an open ring-shaped member, as clearly shown in theend view of Figure 2. When the fuel valve and float are assembled, thehead 44 on valve 28 is placed in the ring, and the neck connecting thehead and the body portion 46 of the valve is interposed between the twofree ends of ears 40 and 42. In place of the annular groove forming theneck of the valve, a shoulder or rib may be formed on the surface of thevalve near the end thereof. When used hereinafter, the word shoulderwill include an annular rib, one side of an annular groove or theunderside of a head such as head 44.

After the head has been inserted in the ring, the ends of the ears maybe pressed inwardly against the underside thereof to eliminatesubstantially all play from the connection so that there will be nobacklash or lost motion between the float lever and fuel valve duringoperation of the float mechanism. In the embodiment shown in Figure 1,as the quantity of fuel in the fuel bowl decreases, the float is adaptedto positively lift the fuel valve from its seat without having to dependon the fuel supply pressure to unseat the valve.

In the embodiment shown in Figures 3, 4 and 5, the

2,702,562 Ce Patented Feb. 22, 1955 ears 40 and 42 are stamped orotherwise severed from the float lever on three sides, leaving the earsintegrally connected to the lever on the fourth side near the outsideedge of the lever. A bar 48 is left between the two ears. The cars arebent downwardly to provide a triangularly-shaped support into which thehead of the fuel valve is inserted. The ends of cars 40 and 42 fitsnugly under the head 44 of the valve, holding the fuel valve in closerelationship to the float lever so that no appreciable play exists inthe connection. The principal advantage of this arrangement over thefirst embodiment is that this arrangement may be fabricated with feweroperations.

Although Figure 5 illustrates the modified form of a float lever, fuelvalve connection, this figure also shows a horizontal fuel inlet valveand a modified form of float lever. This valve and float leverarrangement may be used equally as well in the embodiment of Figures 1and 2. Further arrangements and modifications may be made in the presentfloat mechanism without departing from the scope of the invention.

I claim:

1. In a fuel control mechanism for a float type carburetor, comprising afuel inlet valve having an annular shoulder, a float, a lever joined tosaid float having a longitudinal center portion for engaging one end ofsaid valve and having ears extending from each side thereof forming anopen ring-shaped member, the ends of said ears being disposed adjacentsaid shoulder on opposite sides of said valve and adapted to hold saidvalve end in contact with said center portion.

2. In a fuel control mechanism for a float type carburetor comprising afuel inlet valve having an annular groove near the end opposite thevalve seat, a float, a pivoted lever joined to said float having alongitudinal center portion for engaging one end of said valve andhaving ears of resilient material extending outwardly from each side ofsaid lever, each of said ears being bent in a smooth curve extendingbelow the plane of said lever to extend toward each other in alignmentwith each other, the free ends of said ears being disposed in saidgroove on opposite sides of said valve and adapted to hold said valveend in contact with said center portion.

3. A fuel inlet control mechanism for a float type carburetor comprisinga fuel inlet valve having an annular shoulder near one end thereof, alever having a longitudinal center portion for engaging one end of saidvalve, a float secured to one end of said lever, and a pair of earsjoined to opposite outside edges of said lever near the other endthereof, the free ends of said ears being adapted to embrace saidshoulder on opposite sides of said valve and' adapted to hold said valveend in contact with said center portion.

4. A fuel inlet control mechanism for a carburetor comprising a fuelinlet valve having an annular groove near one end thereof, a float, alever joined to said float and having a longitudinal center portion forengaging one.

end of said valve, ears extending outwardly from each side of said leverand bent in a smooth curve extending below the plane of said lever toextend toward each other, the ends of said ears being adapted to extendinto said groove on opposite sides of said valve and adapted to holdsaid valve end in contact with said center portion, and a pivot for saidlever between said float and said ears.

5. A control mechanism for a fuel valve having an annular shoulderthereon comprising a lever having a longitudinal center portion forengaging one end of said valve, a float secured to said lever, and apair of resilient ears joined to said lever on opposite outside edgesthereof and spaced from said float, said ears extending from said levertoward one another and being adapted to engage said shoulder on oppositesides of said valve to hold said valve end in contact with said centerportion.

6. A control means for a fuel inlet valve having an annular shoulderthereon comprising a flat sheet metal lever, a valve engaging means onsaid lever including a center member for engaging the end of said valve,a slot on each side of said member, and deformable clamping elementsadjacent said slots adapted to engage said annular shoulder and to bepressed firmly against said shoulder whereby a snug fit is obtainedbetween said valve and said lever.

7. A control means for a fuel inlet valve having an annular shoulderthereon comprising a lever of flat sheet metal material, a longitudinalcenter member adjacent one end of the lever for engaging the end of saidvalve, a slot on each side of said member, and a clamping element joinedto said lever along each side thereof adjacent said slots and extendinginwardly for engaging said annular shoulder.

8. A control means for a fuel inlet valve having an annular shoulderthereon comprising a flat sheet metal lever, a longitudinal member inthe center of said lever for engaging the end of said valve, a slot oneach side of said member, a longitudinal member along each side of saidlever adjacent said slots, and a valve engaging element extendinginwardly at an angle to said lever from the inside edge of each of saidside members.

9. A control means for a fuel inlet valve having an annular shoulderthereon comprising a pivoted lever of sheet metal material, alongitudinal member in the center of said lever for engaging the end ofsaid valve, a slot on each side of said member, a longitudinal memberadjacent said slots along each side of said lever, and an elementresiliently secured to and extending inwardly at an angle to said leverfrom the inside edge of each of said members for engaging the shoulderon said valve.

References Cited in the file of this patent UNITED STATES PATENTS312,687 White Feb. 24, 1885 1,015,053 Mayer Jan. 16, 1912 1,129,428Salisbury Feb. 23, 1915 1,313,858 Edge Aug. 19, 1919 1,422,054 July 4,1922 1,463,907 Olson Aug. 7, 1923 1,614,800 1927 1,717,966 19291,802,135 Carter Apr. 21, 1931 1,838,829 Hewig Dec 29, 1931 1,956,777Slagel May 1, 1934 2,164,927 Fohler July 4, 1939 FOREIGN PATENTS 6,242Great Britain Mar. 13, 1912 18,687 Great Britain Sept. 5, 1908

